399092988 has 96 divisors (see below), whose sum is σ = 1097929728. Its totient is φ = 110476800.

The previous prime is 399092963. The next prime is 399093001. The reversal of 399092988 is 889290993.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 3990 and 92988 contains 399092988 itself.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363256 + ... + 364352.

It is an arithmetic number, because the mean of its divisors is an integer number (11436768).

Almost surely, 2^399092988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399092988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (548964864).

399092988 is an abundant number, since it is smaller than the sum of its proper divisors (698836740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399092988 is a wasteful number, since it uses less digits than its factorization.

399092988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 57.

The square root of 399092988 is about 19977.3118311749. The cubic root of 399092988 is about 736.2489681306.

The spelling of 399092988 in words is "three hundred ninety-nine million, ninety-two thousand, nine hundred eighty-eight".